Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to one-time allowable deduction.

No definition available.

Note 21 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 01, 2016
Required Dividend Payout			90.00%
Effective Income Tax Rate, Reconciliation Deductions, One-time Allowable Deduction					$ 85,900
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 1,100
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				$ 55,600
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax			3,500
Taxable Income			313,195	236,853	$ 454,021
Unrecognized Tax Benefits			3,991	4,962	$ 4,263
CANADA
Unrecognized Tax Benefits			$ 4,000
Earliest Tax Year [Member]
Open Tax Year			2011
Latest Tax Year [Member]
Open Tax Year			2017
KRS [Member]
Taxable Income			$ 8,100
Operating Loss Carryforwards			44,000
Deferred Tax Assets, Valuation Allowance						$ 63,500
KRS [Member] \| Amount Utilized [Member]
Operating Loss Carryforwards			$ 8,100
State and Local Jurisdiction [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				7,900
Canada Revenue Agency [Member]
Current Foreign Tax Expense (Benefit)				24,900
Internal Revenue Service (IRS) [Member] \| Earliest Tax Year [Member]
Income Tax Examination, Year under Examination			2004
Internal Revenue Service (IRS) [Member] \| Latest Tax Year [Member]
Income Tax Examination, Year under Examination			2009
Internal Revenue Service (IRS) [Member] \| Tax Year 2009 [Member]
Income Tax Examination, Potential Penalty, Percent			100.00%
Income Tax Examination, Penalties Expense			$ 40,900
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority				(100)
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities				$ 2,000
Mexican Tax Authority [Member] \| Tax Year 2010 [Member]
Income Tax Examination, Year under Examination	2010
Tax Assessment Estimated Tax Expense	$ 33,700
Tax Assessment Estimated Interest Expense	16,500
Tax Assessment Estimated Penalties Expense	11,400
Taxes Payable	$ 0
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%